/*
 *
 *  Copyright (C) 2010 Tal Eisenberg
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package tal.drivechain.chain.shell;

import tal.drivechain.chain.script.ScriptCommand;
import tal.drivechain.expression.dcExpression;
import tal.drivechain.variable.types.DataType;

/**
 * syntax: ["eval" | "evaluate"] [expression]
 * @author eisental
 */
public class EvaluateCommand extends ShellCommand {

    public EvaluateCommand(DriveShell shell) { super(shell); }

    @Override
    public boolean runCommand(ScriptCommand command) throws IllegalArgumentException {
        if (command.getName().equals("eval") || command.getName().equals("evaluate")) {
            dcExpression e = new dcExpression((command.getArg1() + " " + command.getArg2()).trim(), null);
            Object product = e.evaluate(this.shell.getActiveChain());

            String sproduct;
            if (product==null) sproduct = "null-value";
            else {
                DataType d = DataType.findType(product);
                if (d!=null)
                    sproduct = d.getName() + ": " + d.toString(product, this.shell.getActiveChain());
                else sproduct = product.getClass().getCanonicalName() + ": " + product.toString();
            }
            out.println("=> " + sproduct);
            return true;
        } else return false;
    }

    @Override
    public String[] getCommands() {
        String syn = "<expression>";
        return new String[] {"eval " + syn , "evaluate " + syn};
    }

}
